package org.springnext.manager.base.security;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.access.SecurityMetadataSource;
import org.springframework.security.access.intercept.AbstractSecurityInterceptor;
import org.springframework.security.access.intercept.InterceptorStatusToken;
import org.springframework.security.web.FilterInvocation;
import org.springframework.security.web.access.intercept.FilterInvocationSecurityMetadataSource;
import org.springframework.stereotype.Service;

@Service
public class SpringNextFilterSecurityInterceptor  extends AbstractSecurityInterceptor implements Filter{

	@Autowired
    private FilterInvocationSecurityMetadataSource securityMetadataSource;

    @Autowired
    public void setMyAccessDecisionManager(SpringNextAccessDecisionManager springNextAccessDecisionManager) {
        super.setAccessDecisionManager(springNextAccessDecisionManager);
    }

    
	@Override
	public void init(FilterConfig filterConfig) throws ServletException {
		// TODO Auto-generated method stub
		
	}

	@Override
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
			throws IOException, ServletException {
		FilterInvocation fi = new FilterInvocation(request, response, chain);
        invoke(fi);
		
	}
	
	 public void invoke(FilterInvocation fi) throws IOException, ServletException {
		//fi里面有一个被拦截的url
		//里面调用MyInvocationSecurityMetadataSource的getAttributes(Object object)这个方法获取fi对应的所有权限
		//再调用MyAccessDecisionManager的decide方法来校验用户的权限是否足够
		        InterceptorStatusToken token = super.beforeInvocation(fi);
		        try {
		//执行下一个拦截器
		            fi.getChain().doFilter(fi.getRequest(), fi.getResponse());
		        } finally {
		            super.afterInvocation(token, null);
		        }
		    }

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	@Override
	public Class<?> getSecureObjectClass() {
		 return FilterInvocation.class;
	}

	@Override
	public SecurityMetadataSource obtainSecurityMetadataSource() {
		 return this.securityMetadataSource;
	}

}
